This is a great question and we have found that NO bleach is actually used in this process. This is just a term.
DO NOT USE novelty papers. These have all kinds of inks and are just shit.
Zig-Zag white papers use an oxygenation process that leaves no residue of any kind on the paper. There is no “bleach” or chlorine used in the whitening process. “Unbleached” simply means the papers skip this step which means the paper has that natural hue of the fibers versus a classic white look